ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Reddish-orange-emitting Ca₁₂Al₁₄O₃₃: Sm³⁺ phosphors with high color purity

K. Ganesh Kumar, P. Balaji Bhargav, K. Aravinth, Raja Arumugam, P. Ramasamy, and Prathap Pathi

SSN Research Centre, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, India

E-mail: balajibhargavp@ssn.edu.in

Received: 9 June 2021  Accepted: 1 October 2021

Abstract:

Samarium (Sm)-doped Ca₁₂Al₁₄O₃₃ (CAO) phosphors were synthesized using solid-state reaction method. Crystal structure of Sm³⁺-doped CAO was investigated using X-ray diffraction and Raman spectroscopy analysis. Raman active peaks at 320 cm⁻¹, 512 cm⁻¹ and 754 cm⁻¹ and 773 cm⁻¹ were attributed to Ca–O, vibration between Al–O–Al, and ν3 mode of AlO₄⁵⁻ groups, respectively. The optical band-gap for pure and Sm³⁺ ion-doped CAO was calculated to be 4.55 eV and 4.50 eV, respectively. Field emission scanning electron microscope (FESEM) image of synthesized phosphors exhibited agglomerated coin-like structure spread with voids. Luminescence properties were analyzed by photoluminescence (PL) spectra. The emission of reddish-orange light due to transition of ⁴G_5/2- ⁶H_7/2 was observed, which was confirmed by the Commission Internationale de l’Eclairage (CIE) chromatic coordinate graph. The maximum intensity of orange-red light was observed in 0.5% Sm³⁺-doped CAO, and the calculated color purity was 95.2%.

Keywords: Ca12Al14O33; X-ray diffraction; FESEM; Band-gap; Commission Internationale de l’Eclairage; Photoluminescence

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01915-1

Chemical Papers 76 (2) 1147–1155 (2022)